I've been playing Chess.com against their computer set at "Level 10" - never won once. Even the games I thought I might be winning have invariably turned out for the worse as the computer found a way to beat me every single time. It's tough.
If there's a consolation, it's knowing that I'm not alone - the computer today beats everybody. No matter how good you are, there's a computer that can beat you.
I don't know what "Level 10" is other than it's the hardest level on Chess.com or how it stacks up against StockFish or AlphaOne in terms of difficulty. Are there actually people on Chess.com that can beat "Level 10"? It's hard for me to imagine how since I can't.